Physiology 2130 Lecture Notes - Lecture 5: Endoplasmic Reticulum, Troponin, Myosin
8 Dec 2016
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Document Summary
Muscles are biological machines that utilize chemical energy from the breakdown and metabolism of food to perform useful work. These muscles perform three principal functions: movement, heat production and body support and posture. This module examines only the mechanism of muscle contraction as it applies to movement. A whole look at the structure of muscle. This diagram shows that a whole muscle, like the biceps, is composed of groups of fasciculi surrounded by a white connective tissue called perimysium. Each fascicle is made up of bundles of muscles cells (muscle bres). Within each cell there are cylindrical bundles of myo brils. These myo brils are composed of two types of myo laments, which are the actual contractile elements of the cell. Muscle cells (or bres) are one of the few cells in the body with more than one nucleus. They are surrounded by the sarcolemma the muscle cell membrane over which the action potential is transmitted.
